layout/style/DocumentStyleRootIterator.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   5  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "DocumentStyleRootIterator.h"
   8
   9 #include "mozilla/dom/Document.h"
  10 #include "mozilla/dom/Element.h"
  11 #include "nsContentUtils.h"
  12
  13 namespace mozilla {
  14
  15 DocumentStyleRootIterator::DocumentStyleRootIterator(nsINode* aStyleRoot)
  16     : mPosition(0) {
  17   MOZ_COUNT_CTOR(DocumentStyleRootIterator);
  18   MOZ_ASSERT(aStyleRoot);
  19   if (aStyleRoot->IsElement()) {
  20     mStyleRoots.AppendElement(aStyleRoot->AsElement());
  21     return;
  22   }
  23
  24   dom::Document* doc = aStyleRoot->OwnerDoc();
  25   MOZ_ASSERT(doc == aStyleRoot);
  26   if (dom::Element* root = doc->GetRootElement()) {
  27     mStyleRoots.AppendElement(root);
  28   }
  29   nsContentUtils::AppendDocumentLevelNativeAnonymousContentTo(doc, mStyleRoots);
  30 }
  31
  32 dom::Element* DocumentStyleRootIterator::GetNextStyleRoot() {
  33   for (;;) {
  34     if (mPosition >= mStyleRoots.Length()) {
  35       return nullptr;
  36     }
  37
  38     nsIContent* next = mStyleRoots[mPosition];
  39     ++mPosition;
  40
  41     if (next->IsElement()) {
  42       return next->AsElement();
  43     }
  44   }
  45 }
  46
  47 }  // namespace mozilla